remquo

 

C

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Numerics

Common mathematical functions

Floating-point environment

Complex number arithmetics

Random number generation

Type-generic math

 

Common mathematical functions

Functions
Basic operations
abslabsllabsimaxabs (C99) fabs divldivlldivimaxdiv (C99) fmod	remainder (C99) remquo (C99) fma (C99) fmax (C99) fmin (C99) fdim (C99) nannanfnanl (C99)(C99)(C99)
Exponential functions
exp exp2 (C99) expm1 (C99)	log log10 log1p (C99) log2 (C99)
Power functions
sqrt cbrt (C99)	hypot (C99) pow
Trigonometric and hyperbolic functions
sin cos tan asin acos atan atan2	sinh cosh tanh asinh (C99) acosh (C99) atanh (C99)
Error and gamma functions
erf (C99) erfc (C99)	lgamma (C99) tgamma (C99)
Nearest integer floating point operations
ceil floor roundlroundllround (C99)(C99)(C99)	trunc (C99) nearbyint (C99) rintlrintllrint (C99)(C99)(C99)
Floating point manipulation functions
ldexp scalbnscalbln (C99)(C99) ilogb (C99) logb (C99)	frexp modf nextafternexttoward (C99)(C99) copysign (C99)
Classification
fpclassify (C99)
isfinite (C99)
isinf (C99)
isnan (C99)
isnormal (C99)
signbit (C99)
Macro constants
HUGE_VALFHUGE_VALHUGE_VALL (C99)(C99)	FP_NORMALFP_SUBNORMALFP_ZEROFP_INFINITEFP_NAN (C99)(C99)(C99)(C99)(C99)

 

Defined in header <math.h>
float       remquof( float x, float y, int *quo );		(since C99)
double      remquo( double x, double y, int *quo );		(since C99)
long double remquol( long double x, long double y, int *quo );		(since C99)

Computes the remainder of the floating point division operation x/y as the remainder() function does. Additionally, the sign and at least the three of the last bits of x/y will be stored in quo.

Parameters

x, y	-	floating point values
quo	-	pointer to an integer value to store some bits of x/y in

Return value

Remainder of dividing arguments.

Example

remqo <-- 5.1 - (5.1/3.0) * 3.0
          5.1 - (1.7)     * 3.0
          5.1 - (2.0)     * 3.0  (rounded to nearest integer)
          5.1 - 6.0
          -0.9
quo   <-- (int)2.0

Run this code

#include <stdio.h>
#include <math.h>
 
int main()
{
    int quo=0;
 
    printf("                                quo\n");
    printf("                                ---\n");
    printf("remquo(+5.1,+3.0,&quo) = %+.1f", remquo(+5.1,+3.0,&quo));
    printf("    %+2d\n", quo);
    printf("remquo(-5.1,+3.0,&quo) = %+.1f", remquo(-5.1,+3.0,&quo));
    printf("    %+2d\n", quo);
    printf("remquo(+5.1,-3.0,&quo) = %+.1f", remquo(+5.1,-3.0,&quo));
    printf("    %+2d\n", quo);
    printf("remquo(-5.1,-3.0,&quo) = %+.1f", remquo(-5.1,-3.0,&quo));
    printf("    %+2d\n", quo);
 
    return 0;
}

Output:

quo
                                ---
remquo(+5.1,+3.0,&quo) = -0.9    +2
remquo(-5.1,+3.0,&quo) = +0.9    -2
remquo(+5.1,-3.0,&quo) = -0.9    -2
remquo(-5.1,-3.0,&quo) = +0.9    +2

See also

remainder (C99)	signed remainder of the division operation (function)
fmod	remainder of the floating point division operation (function)
divldivlldivimaxdiv (C99)	the quotient and remainder of integer division (function)
C++ documentation for remquo